We should talk more about relay operators selling your data. I don’t know if this is the case, but there is an incentive to do so.
Discussion
This is my second favorite reason to use bostr relays. Only your bostr relay will know your IP and then all other relays will just see it's IP address when it forwards the note.
I wish I could have a more informed take on this topic. From what I do understand, it seems like an unavoidable side effect of censorship resistance.
What information would the relay be able to provide that wouldn't be scrapable from nostr at large?
IP addresses of who sent them the notes / requested the note
Why limit the concern to relay operators? Everyone has access to your posts, profile, replies, follows, etc.